Convert Decimal Number to Binary or Hex Without itoa function

Code

#include <stdio.h>
#include <stdint.h>

void print_base(uint16_t num, uint8_t base) {
    // Your logic here
    if(base == 2){
     uint8_t pos = 0;
        for(int i = 15; i >= 0; i--){
            if((num & (1 << i)) > 0){
                pos = i;
                break;
             }
        }

        for(int i = pos; i >= 0; i--){
             if((num & (1 << i)) > 0){
                printf("1");
             }
             else{
                printf("0");
             }
        }
    }

    else if(base == 16){
      uint8_t pos = 3;
      while( pos > 0 && ((num >> (pos * 4))& 0xF) == 0){
        pos--;
      }

      for(int i = pos ; i >= 0; i--){
        uint8_t val = ((num >> (i * 4))& 0xF);
        if(val < 10){
            printf("%c", '0' + val );
        }
        else{
            printf("%c", 'A' + (val - 10 ));
        }
      }
    }

}

int main() {
    uint16_t num;
    uint8_t base;
    scanf("%hu %hhu", &num, &base);

    print_base(num, base);
    return 0;
}

Solving Approach